mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 332

• Manufacturer Part Number: mpc823rg
• Description: Mpc823 Powerquicc Integrated Communications Processor For Portable Systems
• Manufacturer: Freescale Semiconductor, Inc

External Bus Interface
Figure 13-19 illustrates the device connections on the data bus.
Table 13-2 lists the bytes for read cycles required on the data bus.
Byte
Half-Word
Word
NOTE: — Denotes that a byte is not required during that read cycle.
TRANSFER
SIZE
TSIZE
0
0
0
0
1
1
0
[0:1]
1
1
1
1
0
0
0
Figure 13-19. Interface To Different Port Size Devices
Table 13-2. Data Bus Requirements For Read Cycles
INTERNAL
ADDRESS
A30
OP0
OP0
OP0
OP2
OP0
OP1
OP2
OP3
0
0
1
1
0
1
0
Freescale Semiconductor, Inc.
D[0:7]
A31
For More Information On This Product,
0
1
0
1
0
0
0
D0–D7
MPC823 REFERENCE MANUAL
OP0
OP0
OP0
8-BIT PORT SIZE
—
—
—
—
OP1
OP1
OP1
OP3
Go to: www.freescale.com
D[8:15]
D8–D15
OP1
OP1
OP1
32-BIT PORT SIZE
—
—
—
—
16-BIT PORT SIZE
D16–D23
OP2
OP2
OP2
OP2
OP2
—
—
—
—
D[16:23]
D24–D31
OP3
OP3
—
—
—
—
OP3
OP3
D[24:31]
16-BIT PORT SIZE
D0–D7
OP0
OP2
OP0
OP2
OP0
—
—
32-BIT PORT SIZE
INTERFACE
D8–D15
REGISTER
OUTPUT
OP1
OP3
OP1
OP3
OP1
—
—
MOTOROLA
D0–D7
PORT
8-BIT
SIZE
OP1
OP0
OP2
OP0
OP0
OP2
OP3